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lwip: Implement DHCP hook supporting MTU option

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This commit is contained in:
David Cermak
2022-03-25 20:13:20 +01:00
parent 5aa3be11fd
commit 1564e8d5a9
3 changed files with 34 additions and 0 deletions
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26
components/lwip/port/esp32/hooks/lwip_default_hooks.c
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@@ -5,6 +5,8 @@
*/
#include "lwip_default_hooks.h"
#include "lwip/prot/dhcp.h"
#include "lwip/dhcp.h"
#define __weak __attribute__((weak))
@@ -100,3 +102,27 @@ ip4_route_src_hook(const ip4_addr_t *src,const ip4_addr_t *dest)
}
#endif
#endif /* LWIP_HOOK_IP4_ROUTE_SRC */
void dhcp_parse_extra_opts(struct dhcp *dhcp, uint8_t state, uint8_t option, uint8_t len, struct pbuf* p, uint16_t offset)
{
if ((option == DHCP_OPTION_MTU) &&
(state == DHCP_STATE_REBOOTING || state == DHCP_STATE_REBINDING ||
state == DHCP_STATE_RENEWING || state == DHCP_STATE_REQUESTING)) {
u32_t mtu = 0;
struct netif *netif;
LWIP_ERROR("dhcp_parse_extra_opts(): MTU option's len != 2", len == 2, return;);
LWIP_ERROR("dhcp_parse_extra_opts(): extracting MTU option failed",
pbuf_copy_partial(p, &mtu, 2, offset) == 2, return;);
mtu = lwip_htons((u16_t)mtu);
NETIF_FOREACH(netif) {
/* find the netif related to this dhcp */
if (dhcp == netif_dhcp_data(netif)) {
if (mtu < netif->mtu) {
netif->mtu = mtu;
LWIP_DEBUGF(DHCP_DEBUG | LWIP_DBG_TRACE, ("dhcp_parse_extra_opts(): Negotiated netif MTU is %d\n", netif->mtu));
}
return;
}
}
} /* DHCP_OPTION_MTU */
}